Means for moving cinematographic films



E. A. LARSSON. MEANS FOR MOVING CINEMATOGRAPHIC FILMS.

APPLICATION FlLED MSR. I6, 1920- 1,406,876, Patented Feb. 14, 1922.

2 SHEETS- SHEET I.

l'ibv'enlzr." 'f 6 3 W E. A. LARSSON.

MEANS FOR MOVING CINEMATOGRAPHIC FILMS. APPLICATION FILED .APR. 16. 1920.

1 ,406,876 Patented Feb. 1922.

2 SHEETS-S E T2.

UNITED STA ERNST AXEL LARSSON, OF ALVDALEN, SWEDEN.

MEANS FOR MOVING CINEMATOGRAPI-IIC FILMS.

To all whom it may concern: 2

Be it known that I, ERNST AXnL LARSSON, a citizen of the Kingdom of Sweden, residing at Alvdalen, Sweden, have invented new and useful Improvements in Means for Moving cinematographic F ilms, of which the following is a specification.

This invention relates to means for moving cinematographic films and has for its object to provide means of this kind permitting the use of a feeding roller many times larger than the rollers occurring in the apparatus hitherto used in which the film is fed forward by means of a Geneva stop. Such a greater feeding roller affords the advantage that a greater number of teeth will engage simultaneously the perforations of the film, and owing thereto the power necessary for moving the film is distributed to a greater number of perforations. Conscquently, the stress exerted upon each perforation is reduced in proportion to the number-of perforations employed simultaneously. In the apparatus hitherto in use the perforations of the film are exposed to a rather great stress on account of the small number of teeth engaging the film at a time, and therefore the film is easily liable to be torn asunder, which will cause derailment and even ignition of the film. No doubt, most of the fires deriving from ignited films are caused by torn perforations.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in wl1icl1-- Fig. 1 is a side view of a device for moving cinematographic films arranged according to the invention.

Figure 2 is a top plan view of a portion of the device illustrated in Figure 1.

Figure 3 is an edge view of the driving disc shown in Figure 1.

Figure 4: is an edge view of a modified form of driving disc illustrated in Figure 1 and showing a modified form of cam slot.

Figure 5 is an edge View of the recessed disc shown in Figure 1 and also showing a portionof the stopping lever.

Figure 6 is a similar view showing a modified form of the construction illustrated in Figure 5, and

Figure 7 is a side elevation of the driving device with modified construction of stopping means.

Referring to Figs. 1 to 4:, is a rotating disk or the like provided with a pin or pin Specification of Letters Patent.

Patented Feb. 14, 1922.

Application filed April 16, 1920. Serial No. 374,367.

and roller 2. Positioned in the path of movement of the pin or roller 2 arms 8 or other projections of a rotating star-wheel, disk or the like,each of said arms being provided with a pin or pin and roller 4t. The pins or rollers i are so placed as to be able to engage, during the rotation of the starqvheel, recesses 5 disposed in the periphery of a rotatable disk 6. It will be evident from the above-mentioned that, as the disk 1 rotates with uniform, continuous movement, for instance in the direction indicated by arrow a, the roller 2 will rotate the star wheel, for each revolution of the disk 1, through so great a. part of a revolution, as corresponds. to the number of arms of the star-wheel. The rollers 4; rotate, during the rotation of the star wheel, the disk 6 in the direction indicated by arrow 6 through so great a part of a revolution, as corresponds to the division of the recesses 5.

The disk 6 is connected with the feeding roller of the film (not shown), and the accurate intermittent movement of the latter is brought about by the following stop device. The disk 1 is. provided in its periphery with a cam slot 7, of the shape shown in Fig. Engaging said cam slot is a pin or pin and roller 8 attached to one arm 9 of a double-armed lever adapted to oscillate by -means of pins 11, each journalled in a bearing 10. The other arm 12 of the lever is so located as to be able to enter the recesses 5. The cam slot 7 is so disposed that, just before the roller 2 strikes one of the arms 3, the arm 12 is swung to the side out of engagement with a recess 5, as indicated by fully drawn lines in Fig. 2, while, immediately fter the disk 6 has been rotated through a distance corresponding to one division, the arm 12 is brought into engagement with the recess 5 located right in front of the same, as indicated by dotted lines in Fig. 2.

In order that the arm 12 shall be adapted to enter a recess 5, just before the disk (S has stopped, the arm; 12 as well as the side of each recess 5 coming first in contact with the arm 12 may be beveled at the edges facing each other, as shown in Fig. 5. The same object may be attained to a still greater extent, if the cam slot 7 is shaped as indicated in Fi 4, that is to say, if it forms an angle with a plane at right angles to the shaft of the disk 1 and if, at the same time, one side of each recess 5 is provided with In this a projection 13 shown in Fig. 6 arm 12 case the path of movement of the in relation to the disk 6 is the stippled line shown in Fig. (5.

tion of movement of the disk 6.

In the modified form of the device shown in Fig. 7 the cam slot 7 and the pin or pin and roller 8 are located on the side of the disk 1. In this ca. e the oscillating lever engaging the disk 6 is composed of two parts 14 and 15. The part 14 to which the pin and roller 8 is secured consists of a double-armed lever oscillating about a 'lulcrun'i 16 in a plane parallel to the disks 1 and 6. Pivotally mounted on the part 1% is the part 15 adapted to oscillate in the same manner as part 1-1 and also consisting of a. double armed lever, one arm of which forms a hook 18 capable of engaging recesses 17 in the periphery of the disk 6. Placed between the parts let and 15 is a spring 19 tending to move the part 15 in the direction of the disk 6 and adapted to compensate for the wear and tear ot' the hook 18.

Having now described my invention I declare that what I claim is 1. In means for moving cinematographic films, the combination of a disc secured to the film feeding roller and having recesses at its circumference, a rotary member provided with projections in driving connection with the recesses of said disc, another rotary member in intermittent driving connection with said projections, and a stop device in driven connection with the last mentioned rotary member and in intermittent stopping engagement with the said disc.

2. In means for moving cii'iematographic films, the combination of a disc secured to the film feeding roller and having recesses represented by The arrows in Figs. 5 and 6 indicate the dircc said engagement at its circumference, a rotary member provided with projections in driving connection with therecesses of said disc, another rotary member in intermittent driving connection with said projections, and a swingable l ver in driven connection. with the lastmentioned rotary member, one arm of said lever being in intermittent engagement with the said disc.

3. In means for moving cinematographic films, the combination of a disc secured to the film feeding roller and having recesses at its circumference, a rotary member provided with projections in driving connection with the recesses of said disc, another rotary member in intermittent driving connection with said projections and formed with a cam slot, and aswingable double armed lever engaging said cam slot and being in intermittentstopping engagement with said disc. t

at. In means for moving cinematographic films, the combination of a disc secured to the film feeding roller and having recesses at its circumference, a rotary member provided with projections in driving engagement with the recesses of said disc, another rotary member in intermittent driving conncction with said projections and formed with cam slot, and a swingable doublearmed lever engaging said cam slot and being in intermittent stopping engagement with the recesses of said disc, the said recesses and the arm of the lever engaging therewith being so shaped as to permit during the movement of saidrecesses.

In testimony whereof I have signcdm name.

nnnsr AXEL ansson. 

